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Determining mouse clicks in 3d

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I have a 3d mesh (IM 7.0) that is serving as a ground layer in my game. The iso view is obtained by camera alteration. I've constructed it from a height map so I'm able to retain the "tile" aspect that made data storage/access easy in 2d. Now I'm trying to determine where in the mesh I'm clicking when using the mouse. I understand some of the 2d methods but unfortunately they don't seem to apply well since the rendered tile will often be altered by D3D IM for the obvious reasons. Any suggestions would be greatly appreciated and, as always, thanks in advance!

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